So that tells us it's going to be unforgiving and a marvel to
look at.

But it's what DiCaprio said later in the Yahoo Movies interview
that tells you how all-in DiCaprio was for the role. When asked
if he ever asked himself, "What the hell have I gotten into?"
while filming, the actor answered:

"I can name 30 or 40 sequences that were some of the most
difficult things I’ve ever had to do. Whether it’s going in and
out of frozen rivers, or sleeping in animal carcasses, or what I
ate on set. [I was] enduring freezing cold and possible
hypothermia constantly," said DiCaprio.

Yes, he slept inside a dead animal. And he went on to say that he
also ate raw bison liver.

"When you see the movie, you’ll see my reaction to it, because
Alejandro kept it in. It says it all," he said about eating the
liver.

Watch the trailer below to see how gruesomely real "The Revenant"
will be.